Abstract
The NanChang Spherical Tokamak (NCST) is a new compact tokamak (with an aspect ratio of R/a = 1.67) for exploring the merging compression by which the plasma start-up is highly efficient. In this paper, a magnetic diagnostic system is designed, calibrated, and constructed on the NCST to meet the requirements of measurements. Based on detailed testing and analysis, the reliability of the sensors is guaranteed by optimizing the support structure and installation process. In addition, high-precision positioning equipment is utilized to ensure the installation accuracy of the sensors. During the start-up phase of the NCST, plasma currents on the order of a few kiloamperes were measured despite that the commensurate signal of eddy current is also found in the conducting structure. The magnetic diagnostic system is now completely operational and meets the requirements of the physical analysis on the NCST.
Highlights
The NanChang Spherical Tokamak (NCST) is a compact tokamak with the aim of exploring the method of merging compression for plasma start-up
This paper describes the NCST magnetic diagnostics
Measurement error is an important problem in design and manufacture because it significantly impacts the stability of plasma control and precision of equilibrium reconstruction
Summary
The NanChang Spherical Tokamak (NCST) is a compact tokamak with the aim of exploring the method of merging compression for plasma start-up. It is designed with major radius R = 0.4 m, minor radius a = 0.24 m, toroidal field (TF) BT = 0.36 T, and a plasma current (Ip) of up to 100 kA. Magnetic measurements are a fundamental and crucial diagnostic system for plasma control and physics analysis on magnetic confinement devices.. Magnetic diagnostics is used for mutual verification with the internal sensor of the other plasma diagnostic measurements. Magnetic diagnostics consisting of multiple arrays of sensors is designed, calibrated, and constructed on the NCST
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